Minimal two-band model of the superconducting iron oxypnictides

S. Raghu, Xiao Liang Qi, Chao Xing Liu, D. J. Scalapino, Shou Cheng Zhang

Research output: Contribution to journalArticle

391 Scopus citations

Abstract

Following the discovery of the Fe-pnictide superconductors, local-density approximation (LDA) band structure calculations showed that the dominant contributions to the spectral weight near the Fermi energy came from the Fe3d orbitals. The Fermi surface is characterized by two hole surfaces around the Γ point and two electron surfaces around the M point of the two Fe/cell Brillouin zone. Here, we describe a two-band model that reproduces the topology of the LDA Fermi surface and exhibits both ferromagnetic and q= (π,0) spin-density wave fluctuations. We argue that this minimal model contains the essential low energy physics of these materials.

Original languageEnglish (US)
Article number220503
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number22
DOIs
StatePublished - Jun 11 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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